Opening Day at the Clarendon Hills Park District's Lions Park PoolThis event occurred in the past.

The pool officially opens for the 2015 season. The aquatics center remains open until 8 p.m. on opening day, and is also available for free swim between 11:30 a.m. and 8 p.m. Sunday, May 24, and Monday, May 25. Season pool passes remain available at the Clarendon Hills Park District Community Center, between 9 a.m. and 5 p.m. Mondays through Fridays, and from 9 a.m. to 1 p.m. every Saturday in May.